/*
 * @Author: error: error: git config user.name & please set dead value or install git && error: git config user.email & please set dead value or install git & please set dead value or install git
 * @Date: 2023-10-12 10:33:35
 * @LastEditors: error: error: git config user.name & please set dead value or install git && error: git config user.email & please set dead value or install git & please set dead value or install git
 * @LastEditTime: 2023-11-27 20:00:19
 * @FilePath: /logsystem/logs/format.hpp
 * @Description: 这是默认设置,请设置`customMade`, 打开koroFileHeader查看配置 进行设置: https://github.com/OBKoro1/koro1FileHeader/wiki/%E9%85%8D%E7%BD%AE
 */
#ifndef __M_FMT_H__
#define __M_FMT_H__
#include "level.hpp"
#include "message.hpp"
#include <ctime>
#include <sstream>
#include <vector>
#include <cassert>

namespace zbtlog{
    //抽象格式化子项基类
    class FormatItem{
        public:
        using ptr = std::shared_ptr<FormatItem>;
        virtual void format(std::ostream &out,const LogMsg &msg) = 0;

    };
    //派生格式化子项子类
    //主体消息，日志等级，文件子项，文件名，行号，日志器名称，线程ID，制表符，换行，其他
    class MsgFormatItem: public FormatItem{
        public:
            void format(std::ostream &out,const LogMsg &msg) override{
                out << msg._payload;
            } 
    };
    class LevelFormatItem: public FormatItem{
        public:
            void format(std::ostream &out,const LogMsg &msg) override{
                out << LogLevel::tostring(msg._level);
            } 
    };
    class TimeFormatItem: public FormatItem{
        public:
        TimeFormatItem(const std::string &fmt = "%H:%M:%S"):_time_fmt(fmt){}
            void format(std::ostream &out, const LogMsg &msg) override{
                struct tm t;
                localtime_r(&msg._ctime, &t);
                char tmp[32] = {0};
                strftime(tmp, 31, _time_fmt.c_str(), &t);
                out << tmp;
            }
        private:
            std::string  _time_fmt; //%H:%M:%S
    };
    class FileFormatItem: public FormatItem{
        public:
            void format(std::ostream &out,const LogMsg &msg) override{
                out << msg._file;
            } 
    };
    class LineFormatItem: public FormatItem{
        public:
            void format(std::ostream &out,const LogMsg &msg) override{
                out << msg._line;
            } 
    };
    class ThreadFormatItem: public FormatItem{
        public:
            void format(std::ostream &out,const LogMsg &msg) override{
                out << msg._tid;
            } 
    };
    class LoggerFormatItem: public FormatItem{
        public:
            void format(std::ostream &out,const LogMsg &msg) override{
                out << msg._logger;
            } 
    };
    class TabFormatItem: public FormatItem{
        public:
            void format(std::ostream &out,const LogMsg &msg) override{
                out << "\t";
            } 
    };
    class NLineFormatItem: public FormatItem{
        public:
            void format(std::ostream &out,const LogMsg &msg) override{
                out << "\n";
            } 
    };
    class OtherFormatItem: public FormatItem{
        public:
            OtherFormatItem(const std::string &str):_str(str){}
            void format(std::ostream &out,const LogMsg &msg) override{
                out << _str;
            } 
        private:
            std::string _str;
    };
    /*
        %d 表示日期，包含子格式{%H:%M:%S}
        %t 表示线程ID
        %c 表示日志器名称
        %f 表示源码文件名
        %l 表示源码行号
        %p 表示日志级别
        %T 表示制表符缩进
        %m 表示消息主体
        %n 表示换行
    */
    class Formatter{
        public:
            using ptr = std::shared_ptr<Formatter>;
            Formatter(const std::string &pattern = "[%d{%H:%M:%S}][%t][%c][%f:%l][%p]%T%m%n")
                :_pattern(pattern){
                assert(parsePattern());
            }
            //对msg进行格式化
            void format(std::ostream &out, const LogMsg &msg){
                for(auto &item : _items){
                    item->format(out, msg);
                }
            }
            std::string format(const LogMsg &msg){
                std::stringstream ss;
                format(ss, msg);
                return ss.str();
            }
        private:
            //对格式化规则字符串进行解析
            bool parsePattern(){
                //1.对格式化规则字符串进行解析
                //acdeg[%d{%H:%M:%S}][%p]%T%m%n
                std::vector<std::pair<std::string, std::string>> fmt_order;
                size_t pos = 0;
                std::string key, val;
                while(pos < _pattern.size()){
                    //1.处理原始字符串---判断是否为%，不是就是原始字符串
                    if(_pattern[pos] != '%'){
                        val.push_back(_pattern[pos++]); continue;
                    }
                    //能走下来，就代表pos位置就是%字符，%%的处理结果为一个%原始字符
                    if(pos + 1 < _pattern.size() && _pattern[pos + 1] == '%'){
                        val.push_back('%'); pos += 2; continue;
                    }
                    //走到这里，代表%后面是格式化字符，并且原始字符串处理完毕
                    if(val.empty() == false){
                        fmt_order.push_back(std::make_pair("", val));
                        val.clear();
                    } 
                    //此时pos指向%位置
                    pos += 1;//这一步之后，pos只想格式化字符位置
                    if(pos == _pattern.size()){
                        std::cout << "%之后，没有对应的格式化字符!\n";
                        return false;
                    }

                    key = _pattern[pos];
                    pos += 1;//这时，pos指向格式化字符后的位置
                    //子串的起始位置
                    if(pos < _pattern.size() && _pattern[pos] == '{'){
                        pos += 1;//这时候pos指向{之后，子规则的起始位置
                        while(pos < _pattern.size() && _pattern[pos] != '}'){
                            val.push_back(_pattern[pos++]);
                        }
                        //走至末尾跳出循环，但未遇到}，代表格式出现了问题
                        if(pos == _pattern.size()){
                            std::cout << "子规则{}匹配出错!\n";
                            return false;
                        }
                        pos += 1; //这时候pos只想的是}位置，向后走一步才能到下次的处理位置
                    }
                    fmt_order.push_back(std::make_pair(key, val));
                    key.clear();
                    val.clear();
                }
                //2.根据得到的数据进行格式化子项数组成员
                for(auto &it : fmt_order){
                    _items.push_back(creatItem(it.first, it.second));
                }
                return true;
            }
            //根据不同的格式化字符串创建不同的格式化子项对象
            FormatItem::ptr creatItem(const std::string &key, const std::string &val){
                if(key == "d") return std::make_shared<TimeFormatItem>(val);
                if(key == "t") return std::make_shared<ThreadFormatItem>();
                if(key == "c") return std::make_shared<LoggerFormatItem>();
                if(key == "f") return std::make_shared<FileFormatItem>();
                if(key == "l") return std::make_shared<LineFormatItem>();
                if(key == "p") return std::make_shared<LevelFormatItem>();
                if(key == "T") return std::make_shared<TabFormatItem>();
                if(key == "m") return std::make_shared<MsgFormatItem>();
                if(key == "n") return std::make_shared<NLineFormatItem>();
                if(key == "") return std::make_shared<OtherFormatItem>(val);
                std::cout << "没有对应的格式化字符：%" << key << std::endl;
                abort();
                return FormatItem::ptr();
                
            }
        private:
            std::string _pattern;//格式化规则字符串
            std::vector<FormatItem::ptr> _items;
    };
}
#endif